Wally Cyanide

Wallace "Wally" Cyanide is an associate of Dr. William Rath, Blake Blood, the archenemy and former best friend of Dr. Murphy, and one of the main members of the Brotherhood. A colleague of Dr. Murphy, creator of Zero, Axel, and Black, he wanted to test on living humans and create an army of robots to rule the world but was stopped by Dr. Murphy.

Opposing of Murphy, Cyanide created robots to defeat Zero but failed and was jailed, but was broken free by Ghost and joined the newly established Brotherhood as one of Brian Death's top members. Upon being defeated by Sebastian Harper, he was re-incarcerated.

In an erased future timeline, Cyanide teamed up with Zero's nemesis Xeno to create a doomsday device but was crushed by the falling facility, but caused the death of Aero, Zero's predecessor.